The extra cabin window (six instead of five) is an immediate recognition clue to the HS.125 Srs 600. Also shown in this view is the more slender pod fir the Viper 601 engin, the larger ventral fin and taller top fin.

The HS.125 Series 600 is the second of the two development aircraft. These photographs show the improved appearance resulting from the longer fuselage and nose and deletion of the fairing above the cockpit roof.